Which of the following is not one of the body's three lines of defense against pathogens?
A. Innate actions of cells, proteins, and inflammation
B. Physical barriers such as skin and mucous membranes
C. Drainage of excess interstitial fluid into lymphatic capillaries
D. Specific immunity by B and T cells
Answer: C
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Which of the following is FALSE regarding erection of the penis?
A. It is a result of sympathetic stimulation of vascular smooth muscle in the erectile tissue of the penis. B. It is a spinal reflex. C. It is a result of arteriolar vasodilation and venous constriction of blood vessels in the penis. D. It can be triggered by stimulation of tactile receptors in the penis. E. It can be inhibited by input to the autonomic nerves from higher brain centers.
Assume that the allele controlling brown eyes (B) is dominant over that controlling blue eyes (B) in human beings. (In actuality, eye color in humans is an example of polygene inheritance, which is much more complex than this
) A blue-eyed man marries a brown-eyed woman, and they have six children, all brown-eyed. What is the most likely genotype of the father? What is the most likely genotype of the mother? If a seventh child had blue eyes, what can you conclude about the parents' genotypes? What will be an ideal response
The basic unit of the nervous system is the __________
Fill in the blank(s) with correct word
The male and female reproductive systems begin as an indifferent stage. If testosterone is present, which of the following occurs?
A. The mesonephric ducts atrophy. B. The mesonephric ducts form the ductus deferens. C. The paramesonephric ducts enlarge to form the scrotum. D. The paramesonephric duct forms the vagina. E. The paramesonephric duct atrophies.